2 h 52 m, 30 oct 2001 año - Zygote is formed.

Descripción:

A male and a female go through sexual intercourse. The male gamete or sperm and the female gamete or egg join and form a cell called zygote. Each of the gametes have 23 chromosomes, human zygotes contains 46 chromosomes.

Source
"GCSE Bitesize: Formation of Sex Cells." BBC, BBC,
www.bbc.co.uk/schools/gcsebitesize/science/add_edexcel/cells/mitosisrev2.shtml.